Turning a light on and off with momentary switch
Electronics Forum Index Electronics
Circuits, theory, electrons and discussions.
 
 FAQFAQ   MemberlistMemberlist     RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
 
Google
 
Web ElectronicsHelp.net
Turning a light on and off with momentary switch
Goto page Previous  1, 2, 3, 4  Next
 
Post new topic   Reply to topic    Electronics Forum Index -> Basics
Author Message
Robert Monsen
Guest
Posted: Sun Feb 20, 2005 3:54 am    Post subject: Re: Turning a light on and off with momentary switch Reply with quote
Peter Michelson wrote:
Quote:
Would you (or any other reader without commercial bias) please recommend an
inexpensive and reliable vendor for electronics parts for projects such as
this one? If such recommendations are not allowed on the newsgroup, please
feel free to email them to me.


Here are my links to electronics distributors (US bias)

http://www.acroname.com/
http://www.allcorp.com/
http://www.alliedelec.com/
http://www.aade.com/index.html
http://www.sciplus.com/?emailid=25
http://www.bgmicro.com/
http://store.yahoo.com/webtronics/index.html
http://www.componentkits.com/
http://www.elexp.com/
http://www.findchips.com/
http://www.futurlec.com/
http://www.jameco.com/
http://www.thelaserguy.com/index.html
http://www.mcminone.com/
http://www.meci.com/
http://www.mouser.com/
http://www.moyerelectronics.com/
http://www.mpja.com/
http://www.probemaster.com/
http://www.quickar.com/about.htm
http://www.quickar.com/index.php?session=
http://www.goldmine-elec.com/
http://www.commlinx.com.au/timing.htm
http://www.electronicsurplus.com/
http://alltronics.com/wire_and_cable.htm
http://home.att.net/~wzmicro/index.htm
http://www.alltronics.com/
http://www.lsdiodes.com/5mm/
http://www.hosfelt.com/

I usually use goldmine or futurlec for hobby parts. They don't mind
small orders, and don't charge me sales tax (I'm in california)

You can also get samples of parts from distributors like microchip,
analog, linear, national, fairchild, etc.

--
Regards,
Robert Monsen

"Your Highness, I have no need of this hypothesis."
- Pierre Laplace (1749-1827), to Napoleon,
on why his works on celestial mechanics make no mention of God.

Back to top
Robert Monsen
Guest
Posted: Sun Feb 20, 2005 4:17 am    Post subject: Re: Turning a light on and off with momentary switch Reply with quote
For another possibility, try this link:

http://home.comcast.net/~rcmonsen/flipper.GIF

I built a circuit nearly identical to this one, which I control with a
small 40MHz radio control. The main problem I have is that the radio
control (which I swiped from a toy car) gets occasional hits, which
trigger the device without warning. I have it hooked up to a large,
lighted, mechanical pink flamingo that my wife decided she needed (and
which was on sale for 1/2 price!). Thus, it goes on occasionally by
itself, which is actually kinda fun.

The circuit itself is really just an inverter flipflop, like this:

R1
___
.---------------|___|---------------------------.
| |
| U1A U1B |
| R1 |
| |\ ___ |\ |
'--------| >O---|___|----------o----| >O----o---'
|/ | |/ |
\ o |
S1 \ |
\. |
o |
| R2 |
| ___ |
o----|___|---'
|
--- C1
---
|
GND

(created by AACircuit v1.28 beta 10/06/04 www.tech-chat.de)

except the inverters are NPN common emitter amplifiers instead of
inverters. IF you close the switch for a moment, the inverter U1B
changes state, thus changing the state of the other inverter. If R2 >>
R1, then even when the button is pressed, it won't oscillate. The cap C1
must be large enough to allow the input of U1B to reach it's switching
threshold for long enough to switch, despite the action of R1.

--
Regards,
Robert Monsen

"Your Highness, I have no need of this hypothesis."
- Pierre Laplace (1749-1827), to Napoleon,
on why his works on celestial mechanics make no mention of God.
Back to top
Peter Michelson
Guest
Posted: Sun Feb 20, 2005 5:02 am    Post subject: Re: Turning a light on and off with momentary switch Reply with quote
Thanks for the list of resources, annotations, and candor regarding your
bias :-)
Peter

"Robert Monsen" <rcsurname@comcast.net> wrote in message
news:QeSdnXoSApM8KIrfRVn-gQ@comcast.com...
Quote:
Peter Michelson wrote:
Would you (or any other reader without commercial bias) please recommend
an
inexpensive and reliable vendor for electronics parts for projects such
as
this one? If such recommendations are not allowed on the newsgroup,
please
feel free to email them to me.


Here are my links to electronics distributors (US bias)

http://www.acroname.com/
http://www.allcorp.com/
http://www.alliedelec.com/
http://www.aade.com/index.html
http://www.sciplus.com/?emailid=25
http://www.bgmicro.com/
http://store.yahoo.com/webtronics/index.html
http://www.componentkits.com/
http://www.elexp.com/
http://www.findchips.com/
http://www.futurlec.com/
http://www.jameco.com/
http://www.thelaserguy.com/index.html
http://www.mcminone.com/
http://www.meci.com/
http://www.mouser.com/
http://www.moyerelectronics.com/
http://www.mpja.com/
http://www.probemaster.com/
http://www.quickar.com/about.htm
http://www.quickar.com/index.php?session=
http://www.goldmine-elec.com/
http://www.commlinx.com.au/timing.htm
http://www.electronicsurplus.com/
http://alltronics.com/wire_and_cable.htm
http://home.att.net/~wzmicro/index.htm
http://www.alltronics.com/
http://www.lsdiodes.com/5mm/
http://www.hosfelt.com/

I usually use goldmine or futurlec for hobby parts. They don't mind
small orders, and don't charge me sales tax (I'm in california)

You can also get samples of parts from distributors like microchip,
analog, linear, national, fairchild, etc.

--
Regards,
Robert Monsen

"Your Highness, I have no need of this hypothesis."
- Pierre Laplace (1749-1827), to Napoleon,
on why his works on celestial mechanics make no mention of God.


Back to top
Guest
Posted: Sun Feb 20, 2005 6:10 am    Post subject: Re: Turning a light on and off with momentary switch Reply with quote
Quote:
Would you (or any other reader without commercial bias) please
recommend an inexpensive and reliable vendor for electronics
parts for projects such as this one

Well, you could try Radio Shack, but they seem to have less and less
parts available nowadays.

For mail order, I can think of three, but they may require a minimum
order.

www.digikey.com
www.jameco.com
www.mouser.com

Also, I have a few items for sale on my
website which may be of some use.

http://ourworld.compuserve.com/homepages/Bill_Bowden/sale.htm
Back to top
Si Ballenger
Guest
Posted: Sun Feb 20, 2005 6:10 am    Post subject: Re: Turning a light on and off with momentary switch Reply with quote
On Sat, 19 Feb 2005 16:20:20 -0500, "Peter Michelson"
<pete77r@hotmail.com> wrote:

Quote:
---
Well, in all fairness, Bill's is better than mine in that he has a
single current limiting resistor as opposed to my three. Since only
one LED will be lit at any given time, there's only a need for one and
it can be connected from the common cathodes of the LEDs to ground.

He's suggested using a 555 to debounce the switch, but my simple RC
may work just as well. Depends on the switch's bounce
characteristics.

--
John Fields

For me, there is educational value in seeing multiple approaches to the same
problem, particularly when someone explains the difference between the
various approaches, as you just did. So thank you.

Would you (or any other reader without commercial bias) please recommend an
inexpensive and reliable vendor for electronics parts for projects such as
this one? If such recommendations are not allowed on the newsgroup, please
feel free to email them to me.

The below LED chaser kit for $6.50 would give you most of what
you want. A momentary push button, a 10k resistor and a 1uf
capacitor in parallel to ground for debounce should be sufficient
for manual operation instead of from the 555 timer.

http://www.allelectronics.com/cgi-bin/category.cgi?category=305&item=AEC&type=store
http://www.allelectronics.com/spec/AEC.pdf
Back to top
Peter Michelson
Guest
Posted: Wed Feb 23, 2005 10:04 pm    Post subject: Re: Turning a light on and off with momentary switch Reply with quote
That looks like a handy circuit that could be adapted to my application. I
might fiddle around with it and compare to the others. Thanks.

Do they sell any kits for this that include the mechanical pink flamingo?
:-)

Peter

"Robert Monsen" <rcsurname@comcast.net> wrote in message
news:3dmdnVOV6uGPJorfRVn-hg@comcast.com...
Quote:
For another possibility, try this link:

http://home.comcast.net/~rcmonsen/flipper.GIF

I built a circuit nearly identical to this one, which I control with a
small 40MHz radio control. The main problem I have is that the radio
control (which I swiped from a toy car) gets occasional hits, which
trigger the device without warning. I have it hooked up to a large,
lighted, mechanical pink flamingo that my wife decided she needed (and
which was on sale for 1/2 price!). Thus, it goes on occasionally by
itself, which is actually kinda fun.

The circuit itself is really just an inverter flipflop, like this:

R1
___
.---------------|___|---------------------------.
| |
| U1A U1B |
| R1 |
| |\ ___ |\ |
'--------| >O---|___|----------o----| >O----o---'
|/ | |/ |
\ o |
S1 \ |
\. |
o |
| R2 |
| ___ |
o----|___|---'
|
--- C1
---
|
GND

(created by AACircuit v1.28 beta 10/06/04 www.tech-chat.de)

except the inverters are NPN common emitter amplifiers instead of
inverters. IF you close the switch for a moment, the inverter U1B
changes state, thus changing the state of the other inverter. If R2
R1, then even when the button is pressed, it won't oscillate. The cap C1
must be large enough to allow the input of U1B to reach it's switching
threshold for long enough to switch, despite the action of R1.

--
Regards,
Robert Monsen

"Your Highness, I have no need of this hypothesis."
- Pierre Laplace (1749-1827), to Napoleon,
on why his works on celestial mechanics make no mention of God.
Back to top
Robert Monsen
Guest
Posted: Thu Feb 24, 2005 12:54 am    Post subject: Re: Turning a light on and off with momentary switch Reply with quote
Peter Michelson wrote:
Quote:
That looks like a handy circuit that could be adapted to my application. I
might fiddle around with it and compare to the others. Thanks.

Do they sell any kits for this that include the mechanical pink flamingo?
:-)


Sadly no. The R/C pink flamingo is destined to remain one of a kind.

--
Regards,
Robert Monsen

"Your Highness, I have no need of this hypothesis."
- Pierre Laplace (1749-1827), to Napoleon,
on why his works on celestial mechanics make no mention of God.
Back to top
Rich Grise
Guest
Posted: Thu Feb 24, 2005 4:06 am    Post subject: Re: Turning a light on and off with momentary switch Reply with quote
On Wed, 23 Feb 2005 10:54:03 -0800, Robert Monsen wrote:

Quote:
Peter Michelson wrote:
That looks like a handy circuit that could be adapted to my application. I
might fiddle around with it and compare to the others. Thanks.

Do they sell any kits for this that include the mechanical pink flamingo?
:-)


Sadly no. The R/C pink flamingo is destined to remain one of a kind.

Here Ya Go! ;-)

http://www.animalmakers.com/Secure/RigsPuppetsFolder/BirdsFolder/Birds2.html

Cheers!
Rich
Back to top
Robert Monsen
Guest
Posted: Thu Feb 24, 2005 6:10 am    Post subject: Re: Turning a light on and off with momentary switch Reply with quote
Rich Grise wrote:
Quote:
On Wed, 23 Feb 2005 10:54:03 -0800, Robert Monsen wrote:


Peter Michelson wrote:

That looks like a handy circuit that could be adapted to my application. I
might fiddle around with it and compare to the others. Thanks.

Do they sell any kits for this that include the mechanical pink flamingo?
:-)


Sadly no. The R/C pink flamingo is destined to remain one of a kind.


Here Ya Go! ;-)

http://www.animalmakers.com/Secure/RigsPuppetsFolder/BirdsFolder/Birds2.html

Cheers!
Rich


That is totally high class. The one I got was built out of pink mesh
screen. Only the neck and body move. However, it has several strings of
LEDs in it that flash on and off. It's eyes also flash, if I remember
correctly.

--
Regards,
Robert Monsen

"Your Highness, I have no need of this hypothesis."
- Pierre Laplace (1749-1827), to Napoleon,
on why his works on celestial mechanics make no mention of God.
Back to top
Peter Michelson
Guest
Posted: Fri Feb 25, 2005 5:27 am    Post subject: Re: Turning a light on and off with momentary switch Reply with quote
"Rich Grise" <richgrise@example.net> wrote in message
news:pan.2005.02.23.22.06.20.448693@example.net...
Quote:
Do they sell any kits for this that include the mechanical pink
flamingo?
:-)


Sadly no. The R/C pink flamingo is destined to remain one of a kind.

Here Ya Go! ;-)


http://www.animalmakers.com/Secure/RigsPuppetsFolder/BirdsFolder/Birds2.html

Cheers!
Rich


I can think of no better way to spend $7,750 ;-)
Peter
Back to top
Peter Michelson
Guest
Posted: Fri Feb 25, 2005 5:43 am    Post subject: Re: Turning a light on and off with momentary switch Reply with quote
"Bill Bowden" <wrongaddress@att.net> wrote in message
news:1108675515.525832.218090@g14g2000cwa.googlegroups.com...
Quote:
Peter Michelson wrote:

As I said, I would like to cycle among three LEDs.
To elaborate: one LED is turned on at any given time;
each time I depress the momentary switch, I would like
the LED that is on to turn off, and the next LED
in sequence to turn on;

There is a "10 stage LED sequencer" at the below address.
You will need to change the 555 oscillator into a
555 "one shot" circuit so you can use a pushbutton.
The 4017 can be used for just 3 LEDs by connecting the
reset line (pin 15) to the 4th output, (pin 7).

http://ourworld.compuserve.com/homepages/Bill_Bowden/page5.htm#4017-2.gif

-Bill


First question: can I use more than one stage of the LED sequencer to
prolong the duration of an LED being on? For example, if I want the first
LED to stay on twice as long as the 2nd and 3rd LEDs, is it sufficient to
connect the first two outputs to the first LED, and then only one output to
each of the other two? In other words, is it a problem to connect two
outputs together without using diodes?

Second question: I have decided to use the approach you recommended (using
the 4017 with transistors to boost the outputs, as depicted in the link
above). In order to drive the process, I would like to use a combination of
the simple toggle provided here:
http://www.terrypin.dial.pipex.com/Images/Toggles-Momentary.gif
and the 555 for automatic operation. In other words, I would like to be
able to switch back and forth between using a momentary switch to control
the LEDs and using the 555 to automatically cycle through them.
Could someone please explain the circuit design necessary for switching
back and forth between the two?

Third question: Alternatively, since the 555 can be used as a debouncer by
itself, is it possible to configure the circuit so the 555 could actually be
used both as a debouncer for manual operation and as a timer (which would
obviate the need for the simple toggle above)?

Fourth question (I think I've well exceeded my quota here): is there any
good freeware or open source software for designing circuits and printing
out those designs?

Thanks a bunch,
Peter
Back to top
Guest
Posted: Fri Feb 25, 2005 6:10 am    Post subject: Re: Turning a light on and off with momentary switch Reply with quote
Peter Michelson wrote:
Quote:

First question: can I use more than one stage of the
LED sequencer to prolong the duration of an LED being on?
For example, if I want the first LED to stay on twice as
long as the 2nd and 3rd LEDs, is it sufficient to connect
the first two outputs to the first LED, and then only one
output to each of the other two? In other words, is it a
problem to connect two outputs together without using diodes?


Yes, it is a problem, you need diodes. See my traffic light
circuit for an example:

http://ourworld.compuserve.com/homepages/Bill_Bowden/page10.htm#traffic.gif

-Bill
Back to top
Peter Michelson
Guest
Posted: Sat Feb 26, 2005 2:51 am    Post subject: Re: Turning a light on and off with momentary switch Reply with quote
<wrongaddress@att.net> wrote in message
news:1109305653.532488.48200@o13g2000cwo.googlegroups.com...
Quote:

Peter Michelson wrote:

First question: can I use more than one stage of the
LED sequencer to prolong the duration of an LED being on?
For example, if I want the first LED to stay on twice as
long as the 2nd and 3rd LEDs, is it sufficient to connect
the first two outputs to the first LED, and then only one
output to each of the other two? In other words, is it a
problem to connect two outputs together without using diodes?


Yes, it is a problem, you need diodes. See my traffic light
circuit for an example:


http://ourworld.compuserve.com/homepages/Bill_Bowden/page10.htm#traffic.gif

-Bill


Perfect - thank you. Also, that seems like an elegant/parsimonious circuit
design.

Incidentally, what software do you use for rendering your circuits designs
as they appear on the links you have provided?

Thanks again,
Peter
Back to top
Guest
Posted: Sun Feb 27, 2005 6:10 am    Post subject: Re: Turning a light on and off with momentary switch Reply with quote
Quote:
Incidentally, what software do you use for rendering your
circuits designs as they appear on the links you have
provided?

The software is an old DOS program called "Colorix VGA Paint" 1989.

It's similar to Windows "Paint" with more features.
It's easy to copy and paste, and move things around.
Windows "Paint" can do the same thing, but has limited
editing features.

-Bill
Back to top
Peter Michelson
Guest
Posted: Mon Feb 28, 2005 6:10 am    Post subject: Re: Turning a light on and off with momentary switch Reply with quote
<wrongaddress@att.net> wrote in message
news:1109482647.784238.12890@z14g2000cwz.googlegroups.com...
Quote:
Incidentally, what software do you use for rendering your
circuits designs as they appear on the links you have
provided?

The software is an old DOS program called "Colorix VGA Paint" 1989.

It's similar to Windows "Paint" with more features.
It's easy to copy and paste, and move things around.
Windows "Paint" can do the same thing, but has limited
editing features.

-Bill

Impressive. Because of the high quality, I didn't realize that you drew

them manually. I thought they were created by an electronics CAD program.

Does Colorix VGA Paint run in a DOS window on a pentium class machine?

Regards,
Peter
Back to top
 
Post new topic   Reply to topic    Electronics Forum Index -> Basics All times are GMT
Goto page Previous  1, 2, 3, 4  Next
Page 3 of 4

 
 You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



Home & Living New Topics
Powered by phpBB